Control Concepts provides repair and maintenance services for Lenze and legacy AC Tech drives, servo inverters, motion controllers, and related control equipment. Lenze products are used in a wide range of automation and motion-control applications, and many older Lenze and AC Tech products remain in service today. Our technicians diagnose faults, repair failed components, replace damaged parts, and help restore reliable operation. Lenze’s current portfolio includes inverters and controllers, while its older product catalog includes legacy inverter lines that many facilities still rely on.
Control Concepts provides 24/7 repair and maintenance. Contact us today.
Who Is Lenze / AC Tech?
Lenze is a global manufacturer of motion control and automation technology. Lenze’s current U.S. materials describe the company as a manufacturer of electrical and mechanical drives, motion control, and automation technology. Lenze’s history page states that it acquired U.S. drive technology manufacturer AC Tech in 1999, establishing its first production and logistics site outside Germany.
What Do Lenze / AC Tech Products Do?
Lenze and legacy AC Tech products are designed to control motion, manage speed and torque, and support automation in machine and industrial applications. Common product categories include:
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AC Drives / Frequency Inverters – Lenze frequency inverters are used to adjust speed and control torque in industrial applications. Lenze’s product materials describe its inverters as controlling movement in machines and plants.
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Servo Inverters – Lenze servo inverter products are designed for motion control of one or more servo axes in dynamic machine applications.
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Motion Controllers – Lenze controllers are used as part of broader automation and motion-control systems. Lenze’s current portfolio includes controllers alongside inverters and other automation products.
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Legacy AC Tech Drives – Many older AC Tech and legacy Lenze drive products remain in operation and continue to require diagnostics, repair, and replacement support. Lenze continues to publish support information and legacy product materials for previous inverter families.
Control Concepts has experience diagnosing, repairing, and supporting Lenze and AC Tech drive products to help extend equipment life and reduce downtime.
Lenze / AC Tech Products We Service
Control Concepts repairs and maintains:
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AC drives
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Servo inverters
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Motion controllers
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Legacy Lenze drive products
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Legacy AC Tech drive products
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Related control components
If your Lenze or AC Tech product is not listed here, contact Control Concepts to review your specific service needs.
Industries Using Lenze / AC Tech Products
Lenze and AC Tech products are commonly used in:
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Automotive
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Warehouse Logistics
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Airport Logistics
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Packaging
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Converting and Printing
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Textiles
Lenze’s industry and application materials show strong use in machine building, logistics, packaging, and other automated industrial environments.
Lenze / AC Tech Repair Services
Control Concepts offers a full range of services for Lenze and AC Tech drive systems, including:
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Diagnostics & Troubleshooting – Identify faults affecting drive operation, motion control, or system response
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Component-Level Repair & Replacement – Restore or replace damaged fans, boards, terminals, and power components
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Preventive Maintenance – Inspect and service equipment to reduce unexpected failures
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On-Site Repairs & Support – Perform troubleshooting and system restoration at your facility when needed
Common Issues with Lenze / AC Tech Drives
We regularly service issues such as:
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Software or programming faults
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Cooling fan failures
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Loose or damaged electrical connections
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Drive blowing fuses or tripping breakers
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Drive not running the motor
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Circuit board failures
Overcurrent faults are a common cause of drive shutdowns, which is why troubleshooting should include the drive, motor, and connected operating conditions.
The Control Concepts Repair Process
Inspection
We inspect the drive and terminals for loose, worn, or heat-damaged connections caused by heat cycles, vibration, or improper torque.
Electrical Testing
We perform diode and IGBT testing on the input and output power sections before applying power to help prevent further damage from a short circuit.
Controlled Power-Up
The unit is powered up gradually while monitoring amp readings and output frequency until rated input voltage is reached.
Functional Testing
When appropriate, we back up existing programs and run the drive through basic jog and motor tests to verify output performance, motor rotation, and overall operation.
Final Verification
Each drive is fully tested to confirm proper operation before returning it to service.
Preventive Maintenance Recommendations
To reduce failures and extend equipment life, we recommend:
Keeping drives and control equipment free of dust and debris
Dust buildup can trap heat and affect cooling performance.
Ensuring proper ventilation
Adequate airflow helps prevent overheating and supports reliable operation.
Keeping equipment dry and protected from moisture
Moisture can damage internal electrical components and lead to corrosion or shorts.
Inspecting terminals and connections regularly
Routine checks can help identify loose or heat-damaged connections before they cause downtime.
Scheduling periodic testing and inspection
Regular inspection of power sections, cooling components, and overall operating conditions can help catch problems early and reduce unexpected failures.
Preventive maintenance plays a key role in reducing unplanned downtime and extending equipment life.
24/7 Service and Support
Control Concepts provides 24/7 service and support for Lenze and AC Tech drives. If your system is down, faulting, or showing signs of failure, our team can help diagnose the issue, perform repairs, and support getting your equipment back into operation as quickly as possible.
Need Lenze or AC Tech drive repair? Contact Control Concepts. We’re available 24/7 to help minimize downtime and keep your systems operating reliably.
